A menubar command named either "Smart-Search Documentation" can be found in the "Tools" menu.

The plugin either searches for the statement at caret position or the current selection. It will identify the programming language in use and request filtered results accordingly. A non filtered search over all documentation entries can be invoked by adding the Alt modifier key to the shortcut. "Search all Documentation" is also available in the tools menu.

Configuration

Shortcut

You can change the shortcut at Preferences -> Keymap -> Plug-ins -> Dash.

Toolbar Icon

You can add a button to the toolbar. Right-click the menubar -> Customize […]. You will find the button under "Plug-ins -> Dash".

Supported API Documentation Browsers

Kapeli Dash (Mac OS X)

Dash is an API Documentation Browser and Code Snippet Manager. Dash stores snippets of code and instantly searches offline documentation sets for 150+ APIs (for a full list, see below). You can even generate your own docsets or request docsets to be included. http://kapeli.com/dash